129587891 has 2 divisors, whose sum is σ = 129587892. Its totient is φ = 129587890.

The previous prime is 129587873. The next prime is 129587897. The reversal of 129587891 is 198785921.

It is a strong prime.

It is an emirp because it is prime and its reverse (198785921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129587891 - 2¹⁰ = 129586867 is a prime.

It is not a weakly prime, because it can be changed into another prime (129587897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64793945 + 64793946.

It is an arithmetic number, because the mean of its divisors is an integer number (64793946).

Almost surely, 2^129587891 is an apocalyptic number.

129587891 is a deficient number, since it is larger than the sum of its proper divisors (1).

129587891 is an equidigital number, since it uses as much as digits as its factorization.

129587891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 50.

The square root of 129587891 is about 11383.6677305691. The cubic root of 129587891 is about 506.0438376930.

The spelling of 129587891 in words is "one hundred twenty-nine million, five hundred eighty-seven thousand, eight hundred ninety-one".